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Telecommunication Systems
Erschienen in: Telecommunication Systems 4/2013

01.08.2013

An analytic traffic model with adaptive QoS control in an unreliable wireless sensor network

verfasst von: Shensheng Tang

Erschienen in: Telecommunication Systems | Ausgabe 4/2013

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Abstract

An analytic traffic model is developed for an unreliable wireless sensor network. We model the dynamics of traffic flow from the source node through a set of intermediate nodes to the sink node by using single-server queues. These single-server queues with finite buffers are linked in tandem. To analyze the performance of the sensor network, we decompose the tandem queuing network into individual nodes with modified arrival and service processes and modified queue capacities. In the individual node modeling, we consider the impact of the unreliable transmissions, i.e., node/link failure events, by involving the immediate upstream node and downstream node of the separated node. The steady-state solutions of the individual nodes are determined iteratively. A performance metric source-to-sink delay is derived and selected for studying the quality of service (QoS) control. Adaptive QoS control schemes are developed and their performance is validated by simulation.
Vorheriger Artikel An optimal dynamic resources partitioning auction model for virtual private networks
Nächster Artikel A lightweight identity authentication protocol for vehicular networks

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Fußnoten
1
However, the relaying node can be extended to forward traffic from other paths (if any) not belong to proposed WSN, where some constraints would be introduced, such as the merged traffic should not interfere with the operations of existing traffic, or the existing traffic must have a preemptive priority over the merged traffic, which would cause more complicated analysis.
 
2
Note here we assume each packet at a CH is blocked only by its immediate downstream CH; “blocked by multiple downstream CHs” would lead to more complicated analysis. Note also that this type of blocking should not be confused with the notion of a call getting blocked in a cellular system, which means that a call gets lost if it arrives to find no free channel.
 
3
Note here the conservation of flow is valid, since the packets are only from the sensing cluster and not lost from a CH during its failure time (they are switched to the new CH). If the traffic from external paths merged at an intermediate CH, the conservation of flow would be hard to maintain unless some constraints (e.g. preemptive priority mechanism) are introduced to ensure that the merged traffic should not interfere with the operations of existing traffic in the major path.
 
4
Note that the SSD is a parameter with “mean” sense; it is obtained when the tandem queuing system is in steady state, which implies that some fluctuation of time delay in individual intermediate nodes is allowed. In real situations, it is not easy to control the “instantaneous fluctuation”. This is the reason that the “mean” SSD is introduced here.
 
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Metadaten
Titel
An analytic traffic model with adaptive QoS control in an unreliable wireless sensor network
verfasst von
Shensheng Tang
Publikationsdatum
01.08.2013
Verlag
Springer US
Erschienen in
Telecommunication Systems / Ausgabe 4/2013
Print ISSN: 1018-4864
Elektronische ISSN: 1572-9451
DOI
https://doi.org/10.1007/s11235-013-9707-0

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